wiliest

Example:Comparing the two, the stupidest one couldn't even follow the simplest instructions.

Definition:Seriously lacking in intelligence; slow of understanding.

Example:He was so distracted by his phone, it looked like the dumbest thing in the room.

Definition:Of low mental capacity or lacking intelligence; seemingly unaware of surroundings, especially from lack of attention.

Example:She always tries to avoid being blunt, instead using tactful language.

Definition:Not sensitive to or considerate of others; lacking tact; sudden or direct in manner or speech; discourteous; rude